定义申请OMA LwM2M Model Object

在LwM2M简介中有提到对象定义及资源定义，LwM2M Model即LwM2M协议定义的对象资源模型。LwM2M定义了资源模型，所有信息都可以抽象为资源以提供访问。资源是对象的内在组成，隶属于对象，LwM2M客户端可以拥有任意数量的资源。和对象一样，资源也可以有多个实例。

OMA资源模型由OMA统一管理，现有模型列表参照
https://github.com/OpenMobileAlliance/lwm2m-registry
https://devtoolkit.openmobilealliance.org/OEditor/Default

OMA定义了7个标准对象，LwM2M协议为这些对象及其资源已经定义了固定的ID。用户也可以自定义对象，但需要在GitHub提出issue。对象ID的分配范围如下：

oma Range 0 – 1023 保留给OMA工作组定义的对象。
ext Range 2048 – 10240 专用于第三方标准组织或联盟。
x Range 10241 – 26240 专用于公司或个人。
x Range 26241 – 32768 专用于供应商生产的对象以供重复使用。
x Range 32769 – 42768 专用于供应商保留的对象块（最多50个）

以上在LwM2M对象资源的创建注册标准中都有提到
http://www.openmobilealliance.org/documents/whitepapers/OMA-ORG-Guidelines_Creation_Registration_LwM2M_Objects_Resources-V1_0_1-20190115-A.pdf

那么如何定义申请model呢？可以借助LwM2M 编辑器:
https://devtoolkit.openmobilealliance.org/OEditor/LWMOEdit

编辑手册参考如下：
https://wiki.openmobilealliance.org/display/TOOL/eLwM2M+Editor
https://github.com/OpenMobileAlliance/lwm2m-registry/wiki/Guidelines

定义申请步骤如下：

步骤描述：

附model.xml文件示例：

<?xml version="1.0" encoding="utf-8"?>
<LWM2M  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://openmobilealliance.org/tech/profiles/LWM2M.xsd"><Object ObjectType="MODefinition"><Name>Temperature</Name><Description1>Description: This IPSO object should be used with a temperature sensor to report a temperature measurement.  It also provides resources for minimum/maximum measured values and the minimum/maximum range that can be measured by the temperature sensor. An example measurement unit is degrees Celsius (ucum:Cel).</Description1><ObjectID>3303</ObjectID><ObjectURN>urn:oma:lwm2m:ext:3303</ObjectURN><MultipleInstances>Multiple</MultipleInstances><Mandatory>Optional</Mandatory><Resources><Item ID="5700"><Name>Sensor Value</Name><Operations>R</Operations><MultipleInstances>Single</MultipleInstances><Mandatory>Mandatory</Mandatory><Type>Float</Type><RangeEnumeration></RangeEnumeration><Units>Defined by “Units” resource.</Units><Description>Last or Current Measured Value from the Sensor</Description></Item><Item ID="5601"><Name>Min Measured Value</Name><Operations>R</Operations><MultipleInstances>Single</MultipleInstances><Mandatory>Optional</Mandatory><Type>Float</Type><RangeEnumeration></RangeEnumeration><Units>Defined by “Units” resource.</Units><Description>The minimum value measured by the sensor since power ON or reset</Description></Item><Item ID="5602"><Name>Max Measured Value</Name><Operations>R</Operations><MultipleInstances>Single</MultipleInstances><Mandatory>Optional</Mandatory><Type>Float</Type><RangeEnumeration></RangeEnumeration><Units>Defined by “Units” resource.</Units><Description>The maximum value measured by the sensor since power ON or reset</Description></Item><Item ID="5603"><Name>Min Range Value</Name><Operations>R</Operations><MultipleInstances>Single</MultipleInstances><Mandatory>Optional</Mandatory><Type>Float</Type><RangeEnumeration></RangeEnumeration><Units>Defined by “Units” resource.</Units><Description>The minimum value that can be measured by the sensor</Description></Item><Item ID="5604"><Name>Max Range Value</Name><Operations>R</Operations><MultipleInstances>Single</MultipleInstances><Mandatory>Optional</Mandatory><Type>Float</Type><RangeEnumeration></RangeEnumeration><Units>Defined by “Units” resource.</Units><Description>The maximum value that can be measured by the sensor</Description></Item><Item ID="5701"><Name>Sensor Units</Name><Operations>R</Operations><MultipleInstances>Single</MultipleInstances><Mandatory>Optional</Mandatory><Type>String</Type><RangeEnumeration></RangeEnumeration><Units></Units><Description>Measurement Units Definition e.g. “Cel” for Temperature in Celsius.</Description></Item><Item ID="5605"><Name>Reset Min and Max Measured Values</Name><Operations>E</Operations><MultipleInstances>Single</MultipleInstances><Mandatory>Optional</Mandatory><Type>String</Type><RangeEnumeration></RangeEnumeration><Units></Units><Description>Reset the Min and Max Measured Values to Current Value</Description></Item></Resources><Description2></Description2></Object>
</LWM2M>

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